diff --git a/science/cardioid/files/patch-elec_lazy__array.hh b/science/cardioid/files/patch-elec_lazy__array.hh
new file mode 100644
index 000000000000..ea70ad9a90fa
--- /dev/null
+++ b/science/cardioid/files/patch-elec_lazy__array.hh
@@ -0,0 +1,18 @@
+--- elec/lazy_array.hh.orig	2024-11-03 18:57:59 UTC
++++ elec/lazy_array.hh
+@@ -244,6 +244,7 @@ class lazy_array
+          }
+       }
+    }   
++#if 0 // fix build with clang-19, see https://github.com/LLNL/cardioid/issues/19
+    friend inline void swap(lazy_array<TTT>& first, lazy_array<TTT>& second)
+    {
+       using std::swap;
+@@ -255,6 +256,7 @@ class lazy_array
+          swap(first.isValid_[ispace],second.isValid_[ispace]);
+       }
+    }
++#endif
+    lazy_array<TTT>& operator=(lazy_array<TTT> other)
+    {
+       swap(*this,other);